docs: def getDataset(self, itemId):
          """gets a dataset class"""
          if self._url.lower().find('datasets') > -1:
              url = self._url
          else:
              url = self._url + "/datasets"
          return OpenDataItem(url=url,
                              itemId=itemId,
                              securityHandler=self._securityHandler,
                              proxy_url=self._proxy_url,
                              proxy_port=self._proxy_port)